What does this equation mean?

The gap narrows exactly when verification coverage grows faster than capability does. Axis A determines whether $\mathrm{d}$V/$\mathrm{d}$t can be large at all — whether there is a technique to scale in the first place. Axis B determines how much of any technical gain is actually applied across the field rather than sitting inside one lab’s internal practice, acting as a multiplier on the effective, field-wide growth rate of V . A technique that works in one laboratory’s hands but is never externally audited or adopted elsewhere raises V for that laboratory alone; the field-wide V(t) this equation needs barely moves. That is why the gap is downstream of both axes rather than a genuinely independent third question: no combination of assumptions lets it move without one or both axes above having already moved first.